<template>
  <div>
    <el-upload
      action="https://gulimall-codecrab.oss-cn-beijing.aliyuncs.com"
      :data="dataObj"
      list-type="picture"
      :multiple="false"
      :show-file-list="showFileList"
      :file-list="fileList"
      :before-upload="beforeUpload"
      :on-remove="handleRemove"
      :on-success="handleUploadSuccess"
      :on-preview="handlePreview"
    >
      <el-button size="small" type="primary">点击上传</el-button>
      <div slot="tip" class="el-upload__tip">
        只能上传jpg/png文件，且不超过10MB
      </div>
    </el-upload>
    <el-dialog :visible.sync="dialogVisible">
      <img width="100%" :src="fileList[0].url" alt="" />
    </el-dialog>
  </div>
</template>
<script>
import { policy } from './policy'
import { getUUID } from '@/utils'

export default {
  name: 'singleUpload',
  props: {
    value: String,
    type: String
  },
  computed: {
    imageUrl() {
      return this.value
    },
    imageName() {
      if (this.value != null && this.value !== '') {
        return this.value.substr(this.value.lastIndexOf('/') + 1)
      } else {
        return null
      }
    },
    fileList() {
      return [
        {
          name: this.imageName,
          url: this.imageUrl
        }
      ]
    },
    showFileList: {
      get: function() {
        return (
          this.value !== null && this.value !== '' && this.value !== undefined
        )
      },
      set: function(newValue) {}
    }
  },
  data() {
    return {
      dataObj: {
        policy: '',
        signature: '',
        key: '',
        ossaccessKeyId: '',
        dir: '',
        host: ''
        // callback:'',
      },
      dialogVisible: false
    }
  },
  methods: {
    emitInput(val) {
      this.$emit('input', val)
    },
    handleRemove(file, fileList) {
      this.$http({
        url: this.$http.adornUrl('/thirdparty/oss/remove'),
        method: 'delete',
        data: this.$http.adornData({ urls: [file.url] }, false)
      }).then(res => {
        if (res && res.code === 0) {
          this.emitInput('')
        }
      })
    },
    handlePreview(file) {
      this.dialogVisible = true
    },
    beforeUpload(file) {
      let _self = this
      return new Promise((resolve, reject) => {
        policy(this.type)
          .then(response => {
            _self.dataObj.policy = response.data.policy
            _self.dataObj.signature = response.data.signature
            _self.dataObj.ossaccessKeyId = response.data.accessId
            _self.dataObj.key = response.data.dir + getUUID() + '_${filename}'
            _self.dataObj.dir = response.data.dir
            _self.dataObj.host = response.data.host
            resolve(true)
          })
          .catch(err => {
            reject(false)
          })
      })
    },
    handleUploadSuccess(res, file) {
      //console.log('上传成功...')
      this.showFileList = true
      let remove = this.fileList.pop()
      //console.log(remove)
      if (remove) {
        this.$http({
          url: this.$http.adornUrl('/thirdparty/oss/remove'),
          method: 'delete',
          data: this.$http.adornData({ urls: [remove.url] }, false)
        }).then(res => {})
      }
      this.fileList.push({
        name: file.name,
        url:
          this.dataObj.host +
          '/' +
          this.dataObj.key.replace('${filename}', file.name)
      })
      this.emitInput(this.fileList[0].url)
    }
  }
}
</script>
<style></style>
